the line of reasoning: Moviemania sold 5 percent more popcorn last year than in the previous year--->the claim that the change has hurt the popcorn sales is false.
A:total sales of all refreshment increased less than 5%.可以加强原推论，表明这个改变的确是促进了popcorn的销量。 反之想如果total sales increased more than 5%，而popcorn是5%，那么即使销量增加，也表明change带来的是负面影响。
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发表于 2011-2-5 22:10:58
